A mold clamping mechanism for an injection molding machine

Abstract

The present invention discloses a mold clamping mechanism for an injection molding machine, which solves the technical problems of existing injection molding machines such as large size, bulky structure and high cost. The novel mold clamping mechanism of the injection molding machine includes a fixed mold plate and a movable mold plate, a locking device, a clamping device, a sensing device and a mold opening and closing device. The fixed mold plate is provided with a first non-mold surface in the form of a curved surface, and the movable mold plate is provided with a second non-mold surface in the form of a curved surface. Both the fixed mold plate and the movable mold plate are provided with an inner cavity, which can increase the height of the mold plate, reduce the weight of the mold plate and save production costs. A placement notch is provided on the second non-mold surface, and the clamping device is arranged in the placement notch, which can reduce the length of the pull rod, making the structure of the mold clamping mechanism more compact. The clamping device locks or unlocks the pull rod by rotating two half-brake nuts, occupies a small space and has a more sophisticated structure. An electronic ruler is used to monitor the positions of the pull rod and the piston, making the structure of the mold clamping mechanism more concise.

Description

Technical Field

[0001] The invention relates to the technical field of injection molding machines, in particular to a mold clamping mechanism of an injection molding machine. Background Art

[0002] In the current injection molding machine industry, the two-platen injection molding machine is one of the best solutions for large injection parts in the injection molding machine industry. However, in the traditional two-platen injection molding machine clamping mechanism, the clamping device is installed on the back of the movable template, and the tie rod is relatively long, which makes the size of the entire clamping mechanism larger. In order to adjust the position of the clamping device and the tie rod, a tie rod adjustment cylinder is required, which makes the entire clamping mechanism relatively bulky and increases production costs. In addition, in order to have better rigidity, the weight of the template of the traditional structure is generally heavy. Summary of the Invention

[0003] The present invention is made in consideration of the above-mentioned problems. The purpose of the invention is to provide a clamping mechanism of an injection molding machine, which can reduce the weight of the clamping mechanism, save production costs, and make the entire clamping mechanism more compact and simple.

[0004] To achieve the above object, the present invention provides a mold clamping mechanism for an injection molding machine, comprising:

[0005] A fixed die plate and a movable die plate, wherein the fixed die plate is provided with a first non-die surface in a curved shape, and the movable die plate is provided with a second non-die surface in a curved shape;

[0006] A mold locking device, comprising a mold locking cylinder and a tie rod, wherein the mold locking cylinder is arranged on the first non-mold surface, one end of the tie rod passes through the fixed mold plate and is connected to the mold locking cylinder, and the other end passes through the movable mold plate, and the movable mold plate is movably arranged on the tie rod;

[0007] A clamping device, which is arranged in the movable template and is used to lock or unlock the pull rod;

[0008] A sensing device, which is provided on the mold clamping device and is used to sense the position of the tie rod;

[0009] A mold opening and closing device is arranged on the side of the fixed mold plate and is used to drive the movable mold plate to approach or move away from the fixed mold plate.

[0010] According to the above-mentioned mold clamping mechanism of an injection molding machine, a first boss is provided on the first non-mold surface, the locking cylinder is arranged on the first boss, a second boss is provided on the second non-mold surface, a placement notch is provided on the second boss, the clamping device is arranged in the placement notch, and the fixed mold plate and the movable mold plate are both provided with a cavity.

[0011] According to the above-mentioned mold clamping mechanism of an injection molding machine, a first pull rod hole is provided on the first boss, a second pull rod hole is provided on the second boss, the pull rod is provided with an active end and a driven end, the active end passes through the first pull rod hole and is connected to the clamping cylinder, and the driven end passes through the second pull rod hole and is arranged on the side of the second non-mold surface.

[0012] According to the above-mentioned mold clamping mechanism of an injection molding machine, the clamping cylinder includes a cylinder barrel, a rear cover and a piston, the cylinder barrel is arranged on the first boss, the rear cover is arranged on the cylinder barrel, the piston is slidably arranged in the cylinder barrel, and the piston is provided with a center hole, and the active end is arranged in the center hole.

[0013] According to the above-mentioned injection molding machine mold clamping mechanism, the sensing device includes an electronic ruler and a sensing block, the active end is provided with a groove, the sensing block is arranged in the groove, the electronic ruler is arranged on the back cover, and the electronic ruler is provided with a sensing end, and the sensing end is arranged in the groove.

[0014] According to the above-mentioned mold clamping mechanism of an injection molding machine, the clamping device includes two half-brake nuts, a synchronous turntable and a gasket. A mounting platform is provided in the placement notch. The two half-brake nuts can be rotatably mounted on the mounting platform. The gasket is arranged on the inner wall of the placement notch. The synchronous turntable is arranged on the inner side surface of the gasket and is connected to the two half-brake nuts. The rotation center of the synchronous turntable is arranged on the center line of the pull rod.

[0015] According to the above-mentioned mold clamping mechanism of an injection molding machine, the synchronous turntable is provided with two opposite synchronous grooves, both of which are round head key grooves, one end of the round head key groove is provided with a locking part, and the other end is provided with an unlocking part, and the distance between the locking part and the rotation center of the synchronous turntable is smaller than the distance between the unlocking part and the rotation center of the synchronous turntable.

[0016] According to the above-mentioned mold clamping mechanism of an injection molding machine, each of the half-brake nut is provided with a synchronization pin and a rotating pin, one end of the synchronization pin is connected to the half-brake nut, and the other end is clamped in the synchronization groove, and the synchronization pin can slide along the synchronization groove, one end of the rotating pin is connected to the mounting platform, and the other end is rotatably connected to the half-brake nut.

[0017] According to the above-mentioned injection molding machine mold clamping mechanism, each of the half-brake nut is provided with a first protrusion and a first groove distributed in a corrugated shape, and the pull rod is provided with a second protrusion and a second groove distributed in a corrugated shape. When the clamping device locks the pull rod, the first protrusion is clamped in the second groove, and the second protrusion is clamped in the first groove.

[0018] According to the above-mentioned mold clamping mechanism of an injection molding machine, the mold opening and closing device includes a cylinder body and a telescopic rod. The cylinder body is arranged on the side of the fixed template. One end of the telescopic rod is slidably arranged in the cylinder body, and the other end is connected to the movable template.

[0019] The present invention has the following beneficial effects:

[0020] 1. Both the fixed platen and the movable platen are provided with curved non-mold surfaces and inner cavities, which can improve the platen rigidity, reduce the platen weight and save production costs;

[0021] 2. The holding device locks or unlocks the pull rod by rotating two half brake nuts. The rotary brake structure makes the structure more compact.

[0022] 3. The synchronous turntable is equipped with two opposite synchronous grooves to ensure the synchronization of the movement of the two half brake nuts;

[0023] 4. The clamping device is set in the placement notch, which can shorten the length of the pull rod, make the structure of the mold clamping mechanism more concise, and reduce production costs;

[0024] 5. An electronic ruler is used to monitor the position of the tie rod and piston, and then the position of the tie rod is adjusted, making the structure of the mold clamping mechanism more concise. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 Schematic diagram of the installation of the clamping device of the present invention;

[0027] Figure 3 It is a schematic diagram of the installation of the holding device of the present invention;

[0028] Figure 4 is an end view of the synchronous turntable of the present invention;

[0029] Figure 5 This is an end view of the two half brake nut locking rods of the present invention;

[0030] Figure 6 It is a structural schematic diagram of the curved surface form template of the present invention;

[0031] In the figure: 100, fixed platen; 110, first non-mold surface; 120, first boss; 121, first tie rod hole; 200, movable platen; 210, second non-mold surface; 220, second boss; 221, second tie rod hole; 222, placement notch; 222a, mounting platform; 300, clamping device; 310, clamping cylinder; 311, cylinder barrel; 312, rear cover; 313, piston; 313a, center hole; 320, tie rod; 321, active end; 321a, groove; 322, driven end; 323, second boss; 3 24. Second groove; 400. Clamping device; 410. Half-brake nut; 411. Synchronizing pin; 412. Rotating pin; 413. First protrusion; 414. First groove; 420. Synchronizing turntable; 421. Synchronizing groove; 430. Gasket; 500. Sensing device; 510. Electronic ruler; 511. Sensing end; 520. Sensing block; 600. Mold opening and closing device; 610. Cylinder body; 611. Cylinder body fixing plate; 620. Telescopic rod; 621. Telescopic rod fixing plate; 710. Sliding foot; 720. Adjustable bevel iron; 800. Inner cavity. DETAILED DESCRIPTION

[0032] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0033] like Figure 1-6 As shown, a mold clamping mechanism of an injection molding machine includes:

[0034] The fixed template 100 and the movable template 200, the fixed template 100 is provided with a first non-mold surface 110 in the form of a curved surface, the movable template 200 is provided with a second non-mold surface 210 in the form of a curved surface, the first non-mold surface 110 is provided with a first boss 120, the first boss 120 is used to install the clamping device 300, the second non-mold surface 210 is provided with a second boss 220, the second boss 220 is used to install the clamping device 400, the setting of the boss can enhance the installation stability of the clamping device 300 and the clamping device 400, the fixed template 100 and the movable template 200 are both provided with a non-mold surface in the form of a curved surface, which can improve the rigidity of the template, and the fixed template 100 and the movable template 200 are both provided with a cavity 800, by adjusting the internal structure of the cavity 800, the weight of the template can be greatly reduced, and the mass of the curved template with the same rigidity is less than that of the traditional template, which can save production costs.

[0035] The clamping device 300 includes a clamping cylinder 310 and a pull rod 320. The clamping cylinder 310 is arranged on the first boss 120. The pull rod 320 is provided with an active end 321 and a driven end 322. The first boss 120 is provided with a first pull rod hole 121, and the second boss is provided with a second pull rod hole 221. The active end 321 is bolted to the clamping cylinder 310 through the first pull rod hole 121, and the driven end 322 is arranged on the side of the second non-mold surface 210 of the movable template 200 through the second pull rod hole 221.

[0036] The clamping cylinder 310 includes a cylinder barrel 311, a rear cover 312 and a piston 313. The cylinder barrel 311 is bolted to the first boss 120, the rear cover 312 is bolted to the cylinder barrel 311, and the piston 313 is slidably set on the inner wall of the cylinder barrel 311. The piston 313 is provided with a center hole 313a, and the active end 321 is bolted to the center hole 313a. The cylinder barrel 311 and the first boss 120, the rear cover 312 and the cylinder barrel 311, and the pull rod 320 and the piston 313 are all bolted to facilitate disassembly and maintenance.

[0037] The sensing device 500 includes an electronic ruler 510 and a sensing block 520. The active end 321 is provided with a groove 321a. The sensing block 520 is installed on the inner wall of the groove 321a. The electronic ruler 510 is fixedly connected to the back cover 312. The electronic ruler 510 is provided with a sensing end 511, which is set in the groove 321a. The electronic ruler 510 is used to monitor the position of the sensing block 520, and then determine the position of the pull rod 320. The card slot of the brake nut 410 and the card slot of the pull rod 320 are controlled to match. Through the mutual feedback of electro-hydraulic signals, the movement of the pull rod can be precisely controlled. The use of the electronic ruler 510 instead of the traditional pull rod adjustment cylinder makes the structure more simple.

[0038] The clamping device 400 includes two half brake nuts 410, a synchronous turntable 420 and a gasket 430. The second boss 220 is provided with a placement notch 222, and the placement notch 222 is provided with a mounting platform 222a. The two half brake nuts 410 can be rotatably connected to the mounting platform 222a. The gasket 430 is arranged on the inner wall of the placement notch 222. The synchronous turntable 420 is arranged on the inner side surface of the gasket 430 and is connected to the two half brake nuts 410. The rotation center of the synchronous turntable is set on the center line of the pull rod. The clamping device 400 adopts an embedded installation method, which can reduce the length of the pull rod 320, making the structure of the clamping mechanism more compact.

[0039] The synchronous turntable 420 is provided with two opposite synchronous grooves, both of which are round head key grooves 421. One end of the round head key groove 421 is provided with a locking part, and the other end is provided with an unlocking part. The distance between the locking part and the rotation center of the synchronous disk 420 is smaller than the distance between the unlocking part and the rotation center of the synchronous turntable 420. The setting of the synchronous groove can ensure the synchronization of the movement of the two half brake nuts 410.

[0040] Each half brake nut 410 is provided with a synchronization pin 411 and a rotating pin 412. One end of the synchronization pin 411 is fixedly connected to the half brake nut 410, and the other end is clamped in the synchronization groove 421 and can slide along the synchronization groove 421. One end of the rotating pin 412 is fixedly connected to the mounting platform 222a, and the other end is rotatably connected to the half brake nut 410. The half brake nut 410 is pushed to move by a pneumatic or hydraulic drive. When one of the half brake nuts 410 rotates around the rotating pin 412, due to the synchronization effect of the synchronization turntable 420, the other half brake nut will perform a mirrored movement until the two half brake nuts 410 lock or unlock the pull rod, completing the locking or unlocking process of the pull rod. The rotary brake method is adopted, and the opening and closing stroke is smaller, making the structure of the clamping mechanism more sophisticated.

[0041] The semi-brake nut 410 is provided with a first protrusion 413 and a first groove 414 distributed in a corrugated shape, and the pull rod 320 is provided with a second protrusion 323 and a second groove 324 distributed in a corrugated shape. When the clamping device 400 locks the pull rod 320, the first protrusion 413 is clamped in the second groove 324, and the second protrusion 323 is clamped in the first groove 414. When the clamping device 400 locks the pull rod 320, the mutual cooperation between the protrusion and the groove generates a bite force to ensure the locking effect of the clamping device.

[0042] The mold opening and closing device 600 includes a cylinder body 610 and a telescopic rod 620. The fixed mold plate 100 is provided with a cylinder body fixing seat 611, and the cylinder body fixing seat 611 is fixedly connected to the side of the fixed mold plate. The cylinder body 610 is bolted to the cylinder body fixing seat 611. The movable mold plate 200 is provided with a telescopic rod fixing seat 621, and the telescopic rod fixing seat 621 is fixedly connected to the side of the movable mold plate 200. One end of the telescopic rod 620 is slidably connected to the cylinder body 610, and the other end is bolted to the cylinder body fixing seat 611. The telescopic rod 620 moves back and forth in the cylinder body 610, driving the movable mold plate 200 to move, thereby completing the mold closing and mold opening process of the mold closing mechanism.

[0043] The plate 200 is provided with a sliding foot 710 and an adjustable inclined iron 720. The sliding foot 710 is provided under the movable plate 200. The adjustable inclined iron 720 is provided under the sliding foot 710. By adjusting the distance between the adjustable inclined iron 720, the height of the sliding foot 710 can be controlled, thereby controlling the height of the movable plate 200, ensuring that the movable plate 200 and the fixed plate 100 are at the same height.

[0044] The present invention provides a clamping mechanism for an injection molding machine, wherein both the fixed mold plate and the movable mold plate are provided with a non-mold surface and an inner cavity in the form of a curved surface, which can improve the rigidity of the mold plate, significantly reduce the weight of the mold plate, and save production costs. An electronic ruler is used to monitor the positions of a pull rod and a piston, and the movement of the pull rod can be accurately controlled through mutual feedback of electro-hydraulic signals. The electronic ruler has the characteristic of small size, which makes the structure of the clamping mechanism more concise. A placement notch is provided on the second non-mold surface, and a clamping device is arranged in the placement notch, which can reduce the length of the pull rod, making the structure of the clamping mechanism more compact. The pull rod is locked or unlocked by rotating a semi-brake nut, which occupies less space, making the structure of the clamping mechanism more sophisticated. The semi-brake nut locks the pull rod in a card slot manner, and the card slot can generate a bite force when locking the pull rod to ensure a clamping effect.

[0045] The technical solutions of the present invention have been described in detail above with reference to the accompanying drawings, and the embodiments described are intended to facilitate understanding of the concepts of the present invention. The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments, without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

Claims

1. A mold clamping mechanism for an injection molding machine, characterized in that: include: A fixed die plate and a movable die plate, wherein the fixed die plate is provided with a first non-die surface in a curved shape, and the movable die plate is provided with a second non-die surface in a curved shape; A mold locking device, comprising a mold locking cylinder and a tie rod, wherein the mold locking cylinder is arranged on the first non-mold surface, one end of the tie rod passes through the fixed mold plate and is connected to the mold locking cylinder, and the other end passes through the movable mold plate, and the movable mold plate is movably arranged on the tie rod; A clamping device, which is arranged in the movable template and is used to lock or unlock the pull rod; A sensing device, which is provided on the mold clamping device and is used to sense the position of the tie rod; A mold opening and closing device, which is arranged on the side of the fixed mold plate and is used to drive the movable mold plate to move closer to or away from the fixed mold plate; A first boss is provided on the first non-mold surface, the clamping cylinder is provided on the first boss, a second boss is provided on the second non-mold surface, a placement notch is provided on the second boss, the clamping device is provided in the placement notch, and both the fixed mold plate and the movable mold plate are provided with a cavity; A first tie rod hole is provided on the first boss, a second tie rod hole is provided on the second boss, the tie rod has an active end and a passive end, the active end passes through the first tie rod hole and is connected to the clamping cylinder, and the passive end passes through the second tie rod hole and is arranged on the second non-mold surface side of the movable platen; The clamping cylinder includes a cylinder barrel, a rear cover, and a piston. The cylinder barrel is arranged on the first boss, the rear cover is arranged on the cylinder barrel, the piston is slidably arranged in the cylinder barrel, and the piston is provided with a center hole, and the active end is arranged in the center hole; The sensing device includes an electronic ruler and a sensing block, the active end is provided with a groove, the sensing block is arranged in the groove, the electronic ruler is arranged on the back cover, and the electronic ruler is provided with a sensing end, and the sensing end is arranged in the groove; The mold opening and closing device includes a cylinder body and a telescopic rod. The cylinder body is arranged on the side of the fixed template. One end of the telescopic rod is slidably arranged in the cylinder body, and the other end is connected to the movable template.

2. The mold clamping mechanism of an injection molding machine according to claim 1, characterized in that: The clamping device includes two half-brake nuts, a synchronous turntable and a gasket. A mounting platform is provided in the placement notch. The two half-brake nuts can be rotatably mounted on the mounting platform. The gasket is arranged on the inner wall of the placement notch. The synchronous turntable is arranged on the inner side surface of the gasket and is connected to the two half-brake nuts. The rotation center of the synchronous turntable is arranged on the center line of the pull rod.

3. The mold clamping mechanism of an injection molding machine according to claim 2, characterized in that: The synchronous turntable is provided with two opposite synchronous grooves, both of which are round key grooves, one end of the round key groove is provided with a locking part, and the other end is provided with an unlocking part, and the distance between the locking part and the rotation center of the synchronous turntable is smaller than the distance between the unlocking part and the rotation center of the synchronous turntable.

4. The mold clamping mechanism of an injection molding machine according to claim 3, characterized in that: Each of the half-brake nut is provided with a synchronization pin and a rotating pin. One end of the synchronization pin is connected to the half-brake nut, and the other end is clamped in the synchronization groove, and the synchronization pin can slide along the synchronization groove. One end of the rotating pin is connected to the mounting platform, and the other end is rotatably connected to the half-brake nut.

5. The mold clamping mechanism of an injection molding machine according to claim 4, characterized in that: Each of the half-brake nut is provided with a first protrusion and a first groove distributed in a corrugated shape, and the pull rod is provided with a second protrusion and a second groove distributed in a corrugated shape. When the clamping device locks the pull rod, the first protrusion is clamped in the second groove, and the second protrusion is clamped in the first groove.

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